Device for grinding mower-knife sections.



Noa761,`406. PTEN'IED MAY 31, 1.904.

I'. ROHACH-v v DEVICE FOR GRINDING MOWER KNIFE SECTIONS.

APPLICATION FILED. MAR. 12, 1904. No H QDEL. 2 sHEBTs-sHrnT-l.

TNO. 761,406; PATENTE@ MAY31,1904. v I P. ROHACH.

f vDEVICEv FOR GRINDI'NG MOWBE KNIFE SECTIONS.4

` APPLIoATIoN FILED MAR. 12, 190,4.

SHEETS-SHEET 2.

l l, ,/v

/NVEN'OR ATTO/mem UNITED STATES Patented May 31, 1904.

APATIEAIT QFFICE.

.FLORIAN noIIAcH, F CHICAGO, ILLINOIS.

DEVICE Fon GRINDING MowER-KNI'FE sEoTioNs.

SPECIFICATION forming part of Letta;v Patent No. 761,406, dated Mayen 1904.

Application file.` March 124, 1904. i

To all wil/071e t may concern:

Beit knownfthat I, FLORIAN RoHAoH, a citi'-- zen of the United States of America, and a resident of Chicago, inthe countyof Cook andState ofIllinois, have invented certain new and use.-

ful Improvements in Devices for Grinding Mower-Knife Sections, of which the follow- 'ing is a specification'.

The main objects of my invention are to provide an Improved form of grinding-carriage particularly adapted for grinding knife-sections of mowing machinery; to provide a deing irregularities on the surface of the stone,

ythus avoiding irregular grinding and the consequent drawing of the temper of the knifesection;y to provide a clamping ldevice which will quickly grip and ,releasey the knife-sections, and thus permit of the rapid grinding .of the same, and which may be quickly readjusted for grinding sections differing considerably in form. I accomplishthese objects by the device shown inthe accompanying drawings, in whicht t y Figure luis a'front elevation of a grinding- .carriage constructed according toIny invention, one of the clamp members being removed l vfor the purpose of showing the conformation of the face-plate. Fig.l 2 is a rear elevation ofthe same.` Fig.`3 Yis an end" elevation of. ythe same, showing, partly broken away, the 4grindstone and certain portionsof the frame i of thegrindstone and the runway ofthe carfriage; f Fig. 4C is a side elevation of` one ofthe yielding supporting-hooks of the face-plate.'

.Fig. y5v is a side elevation of the adjusting-H.l hook for adjusting the inclination of the face- L Fig. 6 isa top 'planof the. yielding plate. back brace for the face-plate.- Fig.` 7 is a front elevation of one of the clampmembers which is mounted onv the face-plate. v Fig. 8

is a rear elevation of the same. Fig. 9 is a View showing one of the usual forms of knife- Serial No. 197,761. (No model.) v

sections for the grinding of which the device herein shown'is particularly constructed, the dotted lines indicating the position of adjacent sections of the knife. I

v In the construction shown thegrindstonc 1 is journaled on a horizontal axis in the fame 2. The frame of the grindstone is provided' with a level runway 3, along which the, grinding-carriage4 may be moved in a forward and backward direction across :the face Eof the grindstone. Apair of guide-rollers 51s jour-v naled -on the carriage and bears upon theV guide-rail 6 for guiding the carriagev in a direction parallel with the axis of the grindstone l. The carriage rides upon four roll,- ers 7 A face-plate l8 is mounted on .theI side of the .carriagei'whicli is nearest to the grindstone 1.V The face-plate 8 is rounded at 9'nearthe ends of its lower 'edge and .rests on two: :1.

supporting-hooks 10, which are connected with the frame l of the carriage and provided with springs 11, so as to yieldingly .support the face-plate8. The face-plate Sis adjusted in a vertical angle on itssupporting-ho'oks lOand is prevented from tilting forward by meansof the hook 12, which extends yaround the lower end of the face-plate 8 and bearsagainst itsfront face, as shown yin Fig. 5. Theffaceplate 8 is adjusted angularly by means of the nut 13ony the shank of the hook l2, whichA bears againstthe rear iside of the carriage 4:. The plate 84 is normally heldin a forwardlyinclined position by means of the back brace 14, which iscconnec'ted with a lug 15 on the carriage and normally urged in a forward direction by means of the spring 16, the tension `of which is adjusted by the nut 17. The upj pergedgeofthe face-plate 8 is provided with a straight edge 18, which serves as a guide lining up the edge of the knife-section 19 ijle the clamps are being adjusted for'secns of that particular shape. t

" "fApair of clampmembersffZO mountedl on the front faceof the face-'p `25:85 These are preferably in the form'of sectors provided with pivots 21,"which lit apertures '22 in the .face-plate. The sectors are adapted to be shifted angularly about their pivots 21 and are secured inyany position of adjustment by means of the bolts 23, which pass4 same the spring-clips 27, which ser've to hold the knife-sections 19 against the face of the face-plate 8. The knife-section 19 bears 'at one edge against a key 28, which is set in the keyway 29 of the sector, and another edge of the knife-section bears against a guide-block 29', which is adjustable on the face of the sector. A still further range of adaptability to varying forms of knife-sections may be had by exchanging the blocks 29 with others of different shape and by shifting the bolt which holds the block 29' to the slot 31.

In operation the two sectors 2O are adjusted angularly in their own plane on the front ,of the face-plate to conform with the angle of the cutting edges 30 of the knife-sections, each knife-section being held by one of the sectors when its right-hand edge is being ground and in the other sector when its lefthand edge is being ground. The spring-clips 27 firmly hold the knife-sections in position while the same are being ground, but readily permit of the removal or insertion of a knifesection without readjustment. In practice a section is secured upon each of the sectors, and the carriage is then pushed forward and back across the face of the grindstone, one

movement in each direction being sufficient to grind both of the sections. The sections are then removed. Their positions on the face-plate are reversed, and the other edges are then ground in the same way. The springs on the hooks which support the faceplate 8, together with the spring on the back brace 14, serve to hold the sections in contact with the grindstone and with a yielding uniform pressure, the spring on'th'e back brace permitting the section to yield transversely ofits plane and the springs on the supporting-hooks permitting a slight angular yielding in the plane of the sections. It frequently happens that there are hard spots in the grindstones which do not wear as rapidly as other parts of the stone, and therefore lead to irregular surfaces. For this reason it is desirable to have a yielding support for the section, since a rigid support leads to irregular grinding on account of the irregularities in the surface of the stone and frequently draws the .temper at certain points along the edge of the knife-sections. 'Io change the device for grinding sections of different form, it is merely necessary to swing the sectors to suit the. angle between the cutting edges of the new section, the straight edge 18 serving for lining up the cutting edge, and finally to shift the block 29 to suit the size of the section. A change in the bevel of the sections is made by adjusting the inclination of the face-plate by means of the hook 12 and the back brace 14.

It will be seen that numerous details of the construction shown may be altered without departing from the spirit of my invention.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a device of the class described, the combination of a frame; a carriage movable in a certain direction on said frame; a clamp member mounted on said carriage and adapted to hold a knife-section with one of its cutting edges in a position parallel with the path of said carriage, said clamp member being adjustable angularly for the purpose of adjusting the cutting edge of the knife-section into parallelism with the path Aof the carriage, substantially as described.

2. In a device of the class described, the

combination of a frame; a carriage movable in a certain direction on said frame; a clamp member mounted on said carriage and adapted to hold a knife-section with one of its cutting edges in a position parallel with thc path of said carriage, said clamp member being adjustable angularly about a n axis disposed transversely of the path of the carriage, substantially as described.

3. In a device of thc class described, thc combination of a frame; a carriage movable in a certain direction on said frame; a clamp member mounted on said carriage and adapted to hold a knife-section with one of its cutting edges in a position parallel with the path of said carriage, said clamp member being adg justable angularly about an axis disposed in parallel relation with the path of said carriage, substantially as described.

4. In a device of the class described, the combination of a frame; a grindstone journaled in said frame; a carriage mounted in said frame and adapted to move along a path parallel with the axis of said grindstonc; a clamp member secured to said carriage and adapted to grip a knife-section and hold same in suitable position to bring the cutting edge of said section into contact with said grindstone; means for adjusting said clamp member angularly for shifting said knife-section in its own plane for alining same with the surface of the grindstone; and means for shifting the plane of the knife-section for adjusting the same to suit the bevel of the eutting edge of the knife, substantially as dcscribed.

5. In a device of the class described, the combination of a carriage having rollers adapted to permit the carriage to be moved in a certain direction; a plate secured to one side of said carriage and lying in a plane parallel with the direction of movement of the carriage; a clamp member mounted on said plate and adapted to secure a knife-section to the face IOO IOS

of the plate; meansfor adjusting the knifesection angularly in its own plane and means for adjusting said plate Vin an angle transversely of the plane of the knife-section, said plate being'adapted to yield laterally of its own plane, substantially as described.

6. In a device of.l the class described, the

combination of a carriage having rollers adapted to permit the carriage to be moved in a certain direction; a plate secured to one side of said carriage and lying in a plane parallel With the direction of movement of the carriage; a

'clamp member mounted on said plate'and 7. In a device of the class described, the combination of a carriage having rollers adapted toV permit the carriage to be moved in a cer-v tain direction; a plate secured to one side of said carriage and lying in a plane parallel With the direction of movement of the carriage; a

clamp member .mounted on said plate and adapted to secure a knife-section to the face of, the plate; said clamp member being adjustable angularly in a .plane parallel with the 30A face of said plate, and said plate being adjustable transversely of its own plane, substan- 'tially as described.

Signed atl Chicago this 9th day of March,

I FLGRIAN ROHACH.

Witnesses:

EUGENE A. RUMMLER, RUDoW RUMMLER. 

